4GB Kit 2 x 2GB Memory for Dell PowerEdge 1800 Server PC2-3200R ECC Registered DDR2-400 240 pin 1.8v DIMM (Parts-Quick Brand) Speed: PC2-3200 400MHz Form Factor: 240 pin ECC Registered DIMM 2RX4 Capacity: 4GB Total 2 X 2GB KIT Warranty: Lifetime